How can you organize and manage thread execution sequences?

In Go, several core mechanisms are used to organize and manage the sequence of goroutine execution:

1. Channels — allow synchronization of goroutines by passing data between them. A goroutine reading from a channel will wait until another goroutine sends data, ensuring order.

2. sync.WaitGroup — used to wait for a group of goroutines to finish. It allows waiting until all launched goroutines complete.

3. Mutex and other primitives from the sync package — for protecting shared resources and preventing race conditions.

Example of using channels for sequential execution:

package main

import (
    "fmt"
)

func worker(id int, done chan bool) {
    fmt.Printf("Worker %d started\n", id)
    // simulate work
    done <- true // signal completion
}

func main() {
    done := make(chan bool)

    go worker(1, done)
    <-done // wait for worker 1 to finish

    go worker(2, done)
    <-done // wait for worker 2 to finish

    fmt.Println("All workers done")
}

Thus, by using channels and synchronization, you can control the order of goroutine execution.